All-Solution-Processed Inverted Quantum-Dot Light-Emitting Diodes

Abstract

Quantum dots are a promising new candidate for the emissive material in light-emitting devices for display applications. The fabrication of such devices by solution processing allows considerable cost reduction and is therefore very attractive for industrial manufacturers. We report all solution-processed colloidal quantum-dot light-emitting diodes (QLEDs) with an inverted structure. The red, green, and blue devices showed maximum luminances of 12 510, 32 370, and 249 cd/m(2) and turn-on voltages of 2.8, 3.6, and 3.6 V, respectively. We investigate the effect of a surfactant addition in the hole injection layer (HIL), with the aim of facilitating layer deposition and thereby enhancing device performance. We demonstrate that in the device structure presented in this study, a small amount of surfactant in the HIL can significantly improve the performance of the QLED.

Solution-processed quantum dot light-emitting diodes with PANI:PSS hole-transport interlayers

“…Assuredly, the current efficiency of our QD-LEDs is relatively much low in comparison with the recent works on QD-LEDs fabricated by vacuum evaporation technique. The typical current efficiency of QD-LEDs prepared by all-solution process (with nitrogen ambient in glove box) [36][37][38], combined solution-vacuum process [39], and transfer-printing method [26] is in the range of 0.3-5 cd A À1 . It is noted that our QD-LEDs were prepared by solution process in ambient air.…”

Quantum Dot-Based Light Emitting Diodes (QDLEDs): New Progress

“…Further attempts are aimed to optimize charge injection, to transport, to improve stability of material and to control chemical and physical phenomena at the interface. Also, an all solution-processed QDLED with an inverted structure is investigated by Castan and his coworkers [45]. They demonstrated that the optimized amount of PTE in the PEDOT:PSS can balance the charge in the device.…”

High-efficiency quantum dot remote phosphor film

“…Recent advances in QD sciences have led to nearly 100% quantum efficiency [13][14][15][16][17][18][19], while downconversion occurs only when the excitation light hits QD particles. The probability of hitting a QD particle depends on two factors: the QD particle density and the blue light path length.…”